Illegal speed and red-light cameras

And other evasions of due process for local governments to collect general revenue by arbitrary fining.

San Francisco speed cameras to start issuing fines
Speed warnings in San Francisco are set to turn into fines on Tuesday, ranging from $50 to $500, depending on how fast drivers are going.

This system constitutes an unlawful and unwarranted surveillance of travelers on public highways. There is no basis in law for an automated system to impose fines or court summonses on drivers who are not legitimately observed at the time breaking the law or violating traffic rules.

Traffic violations are not warrantable offenses, either. The cop has to be there at the time. If he didn't stop you then, that was his chance. There are certain limitations on court paperwork, and a termination of jurisdiction begins to apply as soon as you drive off and are not pursued. Videos of crazy driving (or flying or boating) posted online after the fact don't count either. You were not observed at the time, and self-incrimination cannot be considered in such cases even by consent to have occurred in court.